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Efficient Illumination for a Light-Addressable Potentiometric Sensor
| Content Provider | MDPI |
|---|---|
| Author | Yoshinobu, Tatsuo Miyamoto, Ko-Ichiro |
| Copyright Year | 2022 |
| Description | A light-addressable potentiometric sensor (LAPS) is a chemical sensor that is based on the field effect in an electrolyte–insulator–semiconductor structure. It requires modulated illumination for generating an AC photocurrent signal that responds to the activity of target ions on the sensor surface. Although high-power illumination generates a large signal, which is advantageous in terms of the signal-to-noise ratio, excess light power can also be harmful to the sample and the measurement. In this study, we tested different waveforms of modulated illuminations to find an efficient illumination for a LAPS that can enlarge the signal as much as possible for the same input light power. The results showed that a square wave with a low duty ratio was more efficient than a sine wave by a factor of about two. |
| Starting Page | 4541 |
| e-ISSN | 14248220 |
| DOI | 10.3390/s22124541 |
| Journal | Sensors |
| Issue Number | 12 |
| Volume Number | 22 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-06-16 |
| Access Restriction | Open |
| Subject Keyword | Sensors Light-addressable Potentiometric Sensor Laps Ph Sensor Field-effect Device Photocurrent Modulated Illumination Lock-in Detection Waveform Square Wave Duty Ratio |
| Content Type | Text |
| Resource Type | Article |
